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PEWs internet use survey

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According to the Pew Internet & American Life Project, 75% of American adults use the
Internet (Pew Internet website, April 19, 2008). The Pew project authors also reported on
the percentage ofAmericans who use the Internet by age group. The data in the file AgeGroup
are consistent with their findings. These data were obtained from a sample of 100 Internet
users in the 30-49 age group and 200 Internet users in the 50-64 age group. A Yes indicates
the survey repondent had used the Internet; a No indicates the survey repondent had not.

a. Formulate hypotheses that could be used to determine whether the percentage of Internet
users in the two age groups differs from the overall average of 75%.

b. Estimate the proportion of Internet users in the 30-49 age group. Does this proportion
differ significantly from the overall proportion of .75? Use a = .05.

c. Estimate the proportion ofInternet users in the 50-64 age group. Does this proportion
differ significantly from the overall proportion of .75? Use a = .05.

d. Would you expect the proportion of users in the 18-29 age group to be larger or smaller
than the proportion for the 30-49 age group? Support you conclusion with the results
obtained in parts (b) and (c).

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Solution Summary

PEWs internet use survey is examined. The expert formulates a hypothesis that could be used to determine whether the percentage of internet users.

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a. For 30-49 age group:
Ho: p1=0.75
Ha: p1≠0.75
For 50-64 age group:
Ho: p2=0.75
Ha: p2≠0.75

b)this is a two tailed z test.
Test value ...

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